Can't figure out my gas mileage problem :(

[Camaro2k]

i use 93 octane .. and i just realized why my gas milage is a little low than it used t be. cold weather coupled with 165 thermo ... so simple yet so easy to over look. .. i used tog et about 320 ish .. lately i have been getting 260-280 mixed driving ...

[V8 Killer]

93 is complete waste of money.Higher does absolutly NOTHING to an engine if it does not need it.Switch back to at least a 180 thermostat.

[trevor4425]

It might be an exhaust leak, i had the same problem a couple of weeks ago.

[dorkins]

killer, i tried 89 for 1 tank, and it was better than the 87 ive used all the other times

[V8 Killer]

Originally posted by dorkins:
killer, i tried 89 for 1 tank, and it was better than the 87 ive used all the other times

Your engine was built to run on 87...therefore it will run best on 87.its all in your head.

[Rob Bell]

I've tried 93 octane a couple of times and my mileage always goes down. Since the computer is not programmed for it, it's not efficient to use it. It's best to stick with 87, what it was designed for.

[mike h]

i dont understand how higher quality gasoline is bad for an engine. doesnt higher octane mean that it handles higher compression and heat without combusting?

[HeadyFirebird'00]

Thats c o r r e c t.

[F1GT]

Originally posted by V8 Killer:
</font><blockquote>quote:</font><hr />Originally posted by dorkins:
killer, i tried 89 for 1 tank, and it was better than the 87 ive used all the other times

Your engine was built to run on 87...therefore it will run best on 87.its all in your head. </font>[/QUOTE]That is only correct when the motor is new. As carbon deposits build up, a motor actually starts to require higher octane. Unless you do something to clean the deposits. So maybe it's not in his head, but in his motor.

[F1GT]

Originally posted by mike h:
i dont understand how higher quality gasoline is bad for an engine. doesnt higher octane mean that it handles higher compression and heat without combusting?

That is right, but we don't have a high comp motor...

[dorkins]

so... back to the question...
any advice?
its obviously the gas, cause i used both 87 and 89...

does the test at autozone test for that?

the engine only has 59k miles, so it should be fine...

[V8 Killer]

Well if your check engine light is not on dont bother going to autozone.

[Guest]

i get like 220 a tank thats like hybrid city highway. I have 3.73s though, but still.

[Dan Vincent]

Your car shouldn't be running at 210 most of the time, it should be running at 190 or so and only going up to 210 if you're sitting at a red light for a long time. I'd say have your thermostat checked and maybe your coolant changed/radiator flushed if you haven't done it in the past two years.

Do you have a manual or an auto?

[OneQuickV6]

Lol, by my math you're still getting right about 20mpg. Something changed...have you been doing more city and stop-go driving than you used to? Taking a different route to work/school? Hauling around extra weight (chubby girlfriend, jk)?

Side note, why do people always gauge their mileage by how many miles they go on a full tank? And then they compare to a different car, with a different sized tank, and different options? Check your mileage, it's easy! Rest your trip meter after you fill up, drive normally for a fuill tank. Now divide how many miles you drove on that tank, by how many gallons it took the fill up just a few minutes before you started this math. miles/gallons = mpg [img]smile.gif[/img]